I hate the idea of spending $100+ on a infant seat that will only be used for a few months so I'd like to avoid it if possible. However we need to fit 3 seats across in a 97 Pathfinder. We have a highback booster, a ff Radian & only enough room for another 17-18 in seat. For this reason ultimately we will be getting another Radian. How safe is a Radian for a newborn? My babies are slightly small 6lb 14oz, 18 in & 7lb 13oz, 20 in. I read that the lowest strap on a Radian is 9 in. Is that about the same or higher than most infant seats?